Boil the cocktail shrimp in hot water, rinse with cold water, and drain.

Season the boiled shrimp with a pinch of salt and black pepper.

Remove the seeds from the cucumber.

Slice the seedless cucumber thinly at an angle.

Finely chop the green chili.

Slice the onion thinly.

Soak the sliced onion in cold water to remove its sharp taste.

Mix vinegar, soy sauce, and sugar in a bowl.

Add oyster sauce and olive oil to the mixture and stir again.